About Scene switch and update

Dear all,
In my project , have three scene class and a MainGame class:
StartScene
MainMenuScene
BattleScene

everyone of the three class include a Scene object and not inherit Application.

MainGame is inherit Application.

But the scene can’t update ,and the event of scene is lose efficacy.

Now I want to know how to update scene.

Is I have to let them inherit Application ??

I have solved this problem , just a small mistake.
I forget to run the function about loading scene after i instantiation the scene class.